Preparation and characterization of zwitterionic functionalized starch nanoparticles

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Zwitterionic polymers offer unique properties for diverse applications including nanoparticle stabilization, ion exchange, and biomedicine.
• Starch nanoparticles (SNPs) are biocompatible and biodegradable, making them attractive platforms for functionalization.

Purpose of the Study:

• To synthesize zwitterionic functionalized starch nanoparticles (SNPs).
• To characterize the structure and properties of the modified SNPs.
• To evaluate their potential applications in dye absorption and as non-toxic carriers.

Main Methods:

• Two-step synthesis involving carboxymethylation and quaternization of starch nanoparticles.
• Structural confirmation using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) spectroscopy, and elemental analysis.
• Characterization of particle size, dispersion, crystallinity, and isoelectric point.

Main Results:

• Zwitterionic SNPs were successfully prepared with sizes ranging from 30-100 nm and exhibited good dispersion.
• The relative crystallinity of zwitterionic SNPs (35.2%) was higher than that of native SNPs (31.7%).
• The synthesized zwitterionic SNPs demonstrated effective dye absorption capabilities with an isoelectric point around pH 9.4.

Conclusions:

• Zwitterionic functionalization enhances the properties of starch nanoparticles.
• The modified SNPs are effective dye adsorbents.
• These zwitterionic SNPs hold promise as non-toxic carriers for applications in health foods and drug delivery systems.